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Probability_#52
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Consider the following probability mass function of a random variable X

$p(X,q)=\{q\,\,if\,X=0 \\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1-q\,\,\,if\,X=1\\ 0\,\,otherwise$

If q=0.4, the variance of X is.?
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